He doesn't know Mycroft has heard him, when the lights are out and he thinks Mycroft's asleep or he's fixing them breakfast, but Gregory always seems to have a particular song stuck in his head before the politician leaves on a trip. Mycroft has decided to find out what it is and why Gregory hums it when he's going to be gone a while.
- Part 1 of Holmesick
Lestrade finds himself at the policeman's ball, minus his plus one.
- Part 2 of Holmesick