The twelfth episode of season 3. Discovery goes to Boreth, while Spock and Burnham chase after a Section 31 ship. Thus there are two plots. Pike investigating the Time Crystals, and Control laying a trap for Burnham. Both of these plots are presented well. However Chancellor L'Rel is involved as well. The D-7 ship looks suitably classic also. There are other moments through the episode that add to the worldbuilding (and not just on Boreth). More on those, below. To begin, Discovery spore-jumps to Boreth.
(Stamets has fixed it, but more on the topic of the discussion between Culber and Reno below.) Pike goes down to Boreth after L'Rel arrives. That it's not up to her, but up to the Monks themselves, whether he gets access to the Time Crystals is understandable. Such a sacred place would have autonomy (and this, at least is consistent with Rightful Heir, where Gowron chafes at the Monk's decisions about the Kahless clone, even before his nature is realised). The revelation, that the chief Monk is Tyler and L'Rel's son, is an interesting one.
Time Crystals distorting time. Who would have thought of it. (But little relation to the real life time crystals). The way it was presented, with a tree growing in apparent seconds, was done rather well. As was Pike's realisation of his fate. The depiction of the radiation accident was appropriately horrific. (The re-imagination of the beeping chair was quite in line with the other re-imaginings. e.g If Memory Serves and the Enterprise.) However, this particular fate being fixed because he takes that Time Crystal just raises more questions.
Then there is Spock and Burnham on the Section 31 ship. I didn't see it coming that Gant would be Control, so the reveal came as a shock. But why would Control tell Burnham his plan rather than just try to take her over? The time spent gloating was a waste of time, but it certainly saved Burnham from being taken over. (Not saying 'assimilated'. It may look Borg, but I don't think it's the origin of the Collective.) And what did it plan to do about Spock, who would have known that something was up with Control!Burnham?
Back to Culbur and Reno. Certainly seems believable that she would go to him because Staments is distracted thinking about him. That her spouse was lost in the War was also believable. It was certainly an interesting scene, adding some levity to the episode. Overall, it was well worth seeing. 8.25/10.